I've also done some YouTubing to see different kinds of Spanish Walks. The most extreme I have found is this one:
Exceptional Spanish WalkIt shows a very high lifted leg, while maintaining a hindleg which steps far forward. I see it as an example of a well trained Spanish Walk regarding the two aspects that are usually focused on: high leg lift and normal length of strides.
The focus on these points is in my opinion the reason why it falls short in all aspects that are important to me: expression of pride, joy and playful ease.
While thinking about what constitutes the expression I want, I found myself thinking along the lines of what Annette posted. All of the images and videos I've seen so far of Spanish Walks with high lifted and stretched legs show horses who are heavy on the forehand. When trying to combine walking with leg lifting they all lose collection if they had any. But isn't collection needed to get the forehand light, in order to lift a leg effortless?
Next I was looking at videos of collected walk, as I suspected that it is very hard for a horse NOT to be on the forehand in walk when the other foreleg is lifted.
This video I found particularly interesting:
Frollection - free and collected walkIt's an overlay of a free walk and a collected walk, performed by Bent Branderup. It's clear to see that while the neck is more upright and the strides are shorter, there is not so much difference in terms of pelvis rotation and bending of the haunches. I guess that's not really possible in a four beat gait with no suspense phase?
My conclusions so far are that a overly high leg lift is detrimental to a free and easy walk and that the horse should be in a form of collected walk with shorter stride length than usual.
Yesterday, I asked Anna to film me while I tried different cues with Mucki. The result is funny, but not as good as I hoped. Maybe I upload it anyway... The main problem was that I concentrated so much on my own movement, that I moved all awkward in the end and Mucki was a bit lost as to how to interpret that awkwardness
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I concluded once more: the most important ingredient to the Spanish Walk is joy and/or pride. When it becomes an exercise, all the expression is lost and it looks mechanical.
The best version I got yesterday right when I took Mucki from the pasture!
He was so happy to come with me, that he did a Spanish Walk all by himself - just an expression of pure joy!